It looks like you never declared the datatype of loSQL.

What are you asking?

You say that

if input is <= 0 then
whatever error message.

Anything entered that is not an integer, when the data type is integer, it is considered less than (or in some cases equal to) 0 if...

If I were you I would start by looking up tutorials online. They're everywhere on the internet and vbnet also offers its own tutorials where you can create your first few applications yourself. Once...

Yay! I made my first program. It's the quadratic formula for the console. What should I try to make next? Oh yeah, and when it opens the console thingamajig it always closes on its own as soon as the...